Commit graph

44 commits

Author SHA1 Message Date
Frans Kaashoek
40889627ba Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
Russ Cox
48755214c9 assorted fixes:
* rename c/cp to cpu/proc
 * rename cpu.context to cpu.scheduler
 * fix some comments
 * formatting for printout
2009-08-30 23:02:08 -07:00
rsc
2157576107 be consistent: no underscores in function names 2009-03-08 22:07:13 +00:00
rsc
a6c4711a38 bda[0xE] is a 16-bit segment number,
not a real address.  So shift 4.

Reported by Silas.

Jim McKie says this code only matters
on ancient EISA MP systems.
2007-11-28 20:17:04 +00:00
rsc
eb52c7de1d comments; rename irq_ to pic_ 2007-08-28 19:04:36 +00:00
rsc
5516be1fed spaces around else for rtm 2007-08-28 18:37:41 +00:00
rsc
e4d6a21165 more consistent spacing 2007-08-28 18:32:08 +00:00
rsc
558ab49f13 delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
rsc
99b11b6c64 Simplify MP hardware code.
Mainly delete unused constants and code.

Move mp_startthem to main.c as bootothers.
2007-08-27 22:53:31 +00:00
rsc
112873bc65 nits 2007-08-27 16:55:10 +00:00
rsc
da94233784 nits 2007-08-27 16:12:08 +00:00
rsc
cb30c81860 nit 2007-08-24 21:33:11 +00:00
rsc
5788b3604a nit 2006-09-08 15:15:44 +00:00
rsc
4fb684548a formatting nits 2006-09-08 15:14:43 +00:00
kaashoek
5cb7877e0f use bootstrap processor as specified by MP table. typically 0, but not
guaranteed.
2006-09-08 14:48:07 +00:00
rsc
05a7bbe08b comment fixes 2006-09-07 13:07:52 +00:00
kaashoek
f70172129c run without lapic and ioapic, if they are not present
if no lapic available, use 8253pit for clock
now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
2006-09-07 01:37:58 +00:00
rsc
0cfc7290e8 wrap long lines 2006-09-06 19:08:14 +00:00
rsc
48b824703b break single-line if statements 2006-09-06 17:57:47 +00:00
rsc
f552738889 no /* */ comments 2006-09-06 17:50:20 +00:00
rsc
9e9bcaf143 standardize various * conventions 2006-09-06 17:27:19 +00:00
rsc
a650c606fe spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
rtm
dfcc5b997c prune unneeded panics and debug output 2006-08-29 19:06:37 +00:00
rtm
0e84a0ec6e fix race in holding() check in acquire()
give cpu1 a TSS and gdt for when it enters scheduler()
and a pseudo proc[] entry for each cpu
cpu0 waits for each other cpu to start up
read() for files
2006-08-08 19:58:06 +00:00
kaashoek
c8b29f6d03 better interrupt plan---this one appears to work
ioapic
2006-08-04 18:12:31 +00:00
rtm
2927081628 uint32_t -> uint &c 2006-07-20 09:07:53 +00:00
rsc
b5f17007f4 standarize on unix-like lowercase struct names 2006-07-17 01:58:13 +00:00
rsc
b5ee516575 add uint and standardize on typedefs instead of unsigned 2006-07-17 01:52:13 +00:00
rsc
c54c79267f nitpicks 2006-07-17 01:25:22 +00:00
rsc
6e6a1dd7d7 various little fixes that should have been in earlier checkins 2006-07-16 16:06:03 +00:00
rsc
b74f4b57ae Keep interrupts disabled during startup. 2006-07-16 15:50:13 +00:00
kaashoek
f27a68a24a extract lapic code from mp.c 2006-07-12 17:00:54 +00:00
rtm
8148b6ee53 i think my cmpxchg use was wrong in acquire
nesting cli/sti: release shouldn't always enable interrupts
separate setup of lapic from starting of other cpus, so cpu() works earlier
flag to disable locking in console output
make locks work even when curproc==0
(still crashes in clock interrupt)
2006-07-12 11:15:38 +00:00
rtm
4e8f237be8 no more big kernel lock
succeeds at usertests.c pipe test
2006-07-12 01:48:35 +00:00
rsc
5ce9751cab Changes to allow use of native x86 ELF compilers, which on my
Linux 2.4 box using gcc 3.4.6 don't seem to follow the same
conventions as the i386-jos-elf-gcc compilers.
Can run make 'TOOLPREFIX=' or edit the Makefile.

curproc[cpu()] can now be NULL, indicating that no proc is running.
This seemed safer to me than having curproc[0] and curproc[1]
both pointing at proc[0] potentially.

The old implementation of swtch depended on the stack frame layout
used inside swtch being okay to return from on the other stack
(exactly the V6 you are not expected to understand this).
It also could be called in two contexts: at boot time, to schedule
the very first process, and later, on behalf of a process, to sleep
or schedule some other process.

I split this into two functions: scheduler and swtch.

The scheduler is now a separate never-returning function, invoked
by each cpu once set up.  The scheduler looks like:

	scheduler() {
		setjmp(cpu.context);

		pick proc to schedule
		blah blah blah

		longjmp(proc.context)
	}

The new swtch is intended to be called only when curproc[cpu()] is not NULL,
that is, only on behalf of a user proc.  It does:

	swtch() {
		if(setjmp(proc.context) == 0)
			longjmp(cpu.context)
	}

to save the current proc context and then jump over to the scheduler,
running on the cpu stack.

Similarly the system call stubs are now in assembly in usys.S to avoid
needing to know the details of stack frame layout used by the compiler.

Also various changes in the debugging prints.
2006-07-11 01:07:40 +00:00
kaashoek
b22d898297 timer interrupts
disk interrupts (assuming bochs has a bug)
2006-07-05 20:00:14 +00:00
rtm
8b4e2a08fe swtch saves callee-saved registers
swtch idles on per-CPU stack, not on calling process's stack
fix pipe bugs
usertest.c tests pipes, fork, exit, close
2006-07-01 21:26:01 +00:00
kaashoek
f7cea12b38 disable interrupts when holding kernel lock 2006-06-28 16:44:41 +00:00
kaashoek
bd303ed060 timer interrupts 2006-06-28 16:35:03 +00:00
kaashoek
a44ee3cde8 stick mpstack in cpu structure 2006-06-26 16:40:43 +00:00
rtm
89eb5fbe6d boot more than two CPUs, each on own initial stack 2006-06-24 22:47:06 +00:00
rtm
df5cc91659 compile "user programs"
curproc array
2006-06-22 20:47:23 +00:00
kaashoek
21a88fd487 checkpoint. booting second processor. stack is messed up, but thanks to cliff
and plan 9 code, at least boots and gets into C code.
2006-06-22 01:28:57 +00:00
kaashoek
7baa34a421 start on MP; detect MP configuration 2006-06-21 01:53:07 +00:00